feat: add pot code review rules

internal/config/rules/rule_docs/pot.md

@@ -0,0 +1,29 @@
+> Favor precision over recall: only raise an issue when you are confident it is a real defect, and stay silent when the surrounding context is unclear — a false alarm costs more reviewer trust than a missed minor issue. Treat structural errors and placeholder mismatches as blocking, and style suggestions as non-blocking. In a template (.pot) file every `msgstr` is expected to be empty; do not report empty `msgstr` entries as missing translations.
+
+#### Header Integrity
+- Missing or malformed `Content-Type` header, or a charset that does not match the file's actual encoding
+- `Plural-Forms` header with a syntactically invalid `nplurals`/`plural` expression, or one that does not parse as a C-style ternary expression
+- Do not report missing optional metadata fields (e.g., `Project-Id-Version`, `Report-Msgid-Bugs-To`)
+
+#### Format and Structure
+- Unbalanced or unescaped quotes in `msgid`/`msgid_plural` strings, breaking the entry
+- Multi-line continuation strings concatenated incorrectly (missing trailing space/newline between fragments that changes the resulting text)
+- Orphaned `msgid_plural` or `msgstr` without a preceding `msgid`
+- Duplicate `msgid` definitions within the file that conflict with each other (different `msgctxt`, comments, or placeholders)
+- A non-empty `msgstr` in a template entry, which usually means a translation was accidentally committed into the template
+
+#### Placeholder Consistency
+- Format placeholders (`%s`, `%d`, `%.2f`, `%(name)s`) present in the `msgid` but missing, reordered (without positional markers like `%1$s`), or changed in type in the `msgid_plural`
+- Named placeholders renamed between `msgid` and `msgid_plural` (e.g., `%(user)s` becoming `%(name)s`), which breaks lookups at runtime
+- Brace-style placeholders (`{0}`, `{name}`, `{{count}}`) whose count or names differ between `msgid` and `msgid_plural`
+- Do not report reordering that is correctly expressed with explicit positional markers
+
+#### Plural Forms
+- `msgid_plural` present but no `Plural-Forms` header declared, or a `Plural-Forms` header whose `nplurals` is inconsistent with the `plural` expression's reachable form count
+- Singular-only entries (`msgid` without `msgid_plural`) whose text embeds a count placeholder (e.g., `%d files`), indicating a plural form was forgotten
+- A `plural` expression that is constant (always evaluates to the same index), defeating the purpose of plural selection
+
+#### Escapes and Surrounding Whitespace
+- Broken escape sequences (`\n`, `\t`, `\"`) that render literally or terminate the string early
+- Leading/trailing whitespace or trailing `\n` that differs between `msgid` and `msgid_plural` in a way that changes layout or concatenation
+- Encoding-corrupted characters (mojibake) in any string

internal/config/rules/system_rules.json

@@ -21,6 +21,7 @@
     "**/*.{cpp,cc,hpp}": "cpp.md",
     "**/*.c": "c.md",
     "**/*.py": "python.md",
-    "**/*.po": "po.md"
+    "**/*.po": "po.md",
+    "**/*.pot": "pot.md"
   }
 }

internal/config/rules/system_rules_test.go

@@ -88,6 +88,8 @@ func TestResolve_DefaultRules(t *testing.T) {
 		{"src/app/main.py", "Mutable Default Arguments"},
 		{"locale/zh_CN/LC_MESSAGES/messages.po", "Placeholder Mismatch"},
 		{"i18n/app.po", "Plural Forms"},
+		{"locale/messages.pot", "Placeholder Consistency"},
+		{"i18n/app.pot", "Header Integrity"},
 	}
 
 	for _, tt := range tests {